mirrors/ladybird
0
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-09-09 19:16:02 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 13

Kernel: Don't update Thread TSS if scheduler tick reschedules it

Browse source 
If we didn't find anything else that wants to run, we don't need to
update the current thread's TSS since we're just gonna return to the
same thread anyway.
This commit is contained in:
Andreas Kling 2019-10-02 13:45:26 +02:00
commit c33ac7f170
Notes: sideshowbarker 2024-07-19 11:51:32 +09:00
1 changed files with 26 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

50
Kernel/Scheduler.cpp
View file

@ -540,33 +540,35 @@ void Scheduler::timer_tick(RegisterDump& regs)
if (current->tick())
return;
current->tss().gs = regs.gs;
current->tss().fs = regs.fs;
current->tss().es = regs.es;
current->tss().ds = regs.ds;
current->tss().edi = regs.edi;
current->tss().esi = regs.esi;
current->tss().ebp = regs.ebp;
current->tss().ebx = regs.ebx;
current->tss().edx = regs.edx;
current->tss().ecx = regs.ecx;
current->tss().eax = regs.eax;
current->tss().eip = regs.eip;
current->tss().cs = regs.cs;
current->tss().eflags = regs.eflags;
// Compute process stack pointer.
// Add 12 for CS, EIP, EFLAGS (interrupt mechanic)
current->tss().esp = regs.esp + 12;
current->tss().ss = regs.ss;
if ((current->tss().cs & 3) != 0) {
current->tss().ss = regs.ss_if_crossRing;
current->tss().esp = regs.esp_if_crossRing;
}
auto& outgoing_tss = current->tss();
if (!pick_next())
return;
outgoing_tss.gs = regs.gs;
outgoing_tss.fs = regs.fs;
outgoing_tss.es = regs.es;
outgoing_tss.ds = regs.ds;
outgoing_tss.edi = regs.edi;
outgoing_tss.esi = regs.esi;
outgoing_tss.ebp = regs.ebp;
outgoing_tss.ebx = regs.ebx;
outgoing_tss.edx = regs.edx;
outgoing_tss.ecx = regs.ecx;
outgoing_tss.eax = regs.eax;
outgoing_tss.eip = regs.eip;
outgoing_tss.cs = regs.cs;
outgoing_tss.eflags = regs.eflags;
// Compute process stack pointer.
// Add 12 for CS, EIP, EFLAGS (interrupt mechanic)
outgoing_tss.esp = regs.esp + 12;
outgoing_tss.ss = regs.ss;
if ((outgoing_tss.cs & 3) != 0) {
outgoing_tss.ss = regs.ss_if_crossRing;
outgoing_tss.esp = regs.esp_if_crossRing;
}
prepare_for_iret_to_new_process();
// Set the NT (nested task) flag.